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    <article class="post">
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            <h1 class="post-title">Android应用中是怎么调用系统相册中的照片的</h1>
        </header>
        <date class="post-meta meta-date">
            2021年8月15日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/android'>android</a></span>
            
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        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
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        <div class="post-content">
            <p>Android应用中是怎么调用系统相册中的照片的？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。</p>
<h4 id="使用步骤">使用步骤</h4>
<p>这里我是通过一个简单的demo来讲解怎么去实现这个功能。首先看布局：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"> <span style="color:#f92672">&lt;</span>Button
  android<span style="color:#f92672">:</span>id<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;@+id/button2&#34;</span>
  android<span style="color:#f92672">:</span>layout_width<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;wrap_content&#34;</span>
  android<span style="color:#f92672">:</span>layout_height<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;wrap_content&#34;</span>
  android<span style="color:#f92672">:</span>layout_marginTop<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;5dp&#34;</span>
  android<span style="color:#f92672">:</span>layout_marginEnd<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;52dp&#34;</span>
  android<span style="color:#f92672">:</span>layout_marginRight<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;52dp&#34;</span>
  android<span style="color:#f92672">:</span>text<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;choose&#34;</span>
  app<span style="color:#f92672">:</span>layout_constraintEnd_toEndOf<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;parent&#34;</span>
  app<span style="color:#f92672">:</span>layout_constraintTop_toTopOf<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;parent&#34;</span> <span style="color:#f92672">/&gt;</span>

 <span style="color:#f92672">&lt;</span>ImageView
  android<span style="color:#f92672">:</span>id<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;@+id/imageView&#34;</span>
  android<span style="color:#f92672">:</span>layout_width<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;wrap_content&#34;</span>
  android<span style="color:#f92672">:</span>layout_height<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;wrap_content&#34;</span>
  android<span style="color:#f92672">:</span>layout_marginTop<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;29dp&#34;</span>
  app<span style="color:#f92672">:</span>layout_constraintEnd_toEndOf<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;parent&#34;</span>
  app<span style="color:#f92672">:</span>layout_constraintStart_toStartOf<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;parent&#34;</span>
  app<span style="color:#f92672">:</span>layout_constraintTop_toBottomOf<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;@+id/button&#34;</span>
  app<span style="color:#f92672">:</span>srcCompat<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;@mipmap/ic_launcher_round&#34;</span> <span style="color:#f92672">/&gt;</span>
</code></pre></div><p>很简单，就是一个按钮和一个imageView。然后接下来让我们想想这个功能怎么去实现：</p>
<p>首先打开相册，那么肯定要通过隐式启动相册activity；然后相册返回一个路径，我们就拿这个路径把路径上对应的照片展示出来。思路挺简单的，让我们写写看：
首先看代码：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"> <span style="color:#66d9ef">private</span> Uri imageUri<span style="color:#f92672">;</span>
 <span style="color:#66d9ef">private</span> ImageView imageView<span style="color:#f92672">;</span>

 <span style="color:#a6e22e">@Override</span>
 <span style="color:#66d9ef">protected</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">onCreate</span><span style="color:#f92672">(</span>Bundle savedInstanceState<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
  <span style="color:#66d9ef">super</span><span style="color:#f92672">.</span><span style="color:#a6e22e">onCreate</span><span style="color:#f92672">(</span>savedInstanceState<span style="color:#f92672">);</span>
  setContentView<span style="color:#f92672">(</span>R<span style="color:#f92672">.</span><span style="color:#a6e22e">layout</span><span style="color:#f92672">.</span><span style="color:#a6e22e">activity_main</span><span style="color:#f92672">);</span>
  imageView <span style="color:#f92672">=</span> findViewById<span style="color:#f92672">(</span>R<span style="color:#f92672">.</span><span style="color:#a6e22e">id</span><span style="color:#f92672">.</span><span style="color:#a6e22e">imageView</span><span style="color:#f92672">);</span>
  Button button1 <span style="color:#f92672">=</span> findViewById<span style="color:#f92672">(</span>R<span style="color:#f92672">.</span><span style="color:#a6e22e">id</span><span style="color:#f92672">.</span><span style="color:#a6e22e">button2</span><span style="color:#f92672">);</span>
  button1<span style="color:#f92672">.</span><span style="color:#a6e22e">setOnClickListener</span><span style="color:#f92672">(</span><span style="color:#66d9ef">new</span> View<span style="color:#f92672">.</span><span style="color:#a6e22e">OnClickListener</span><span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
   <span style="color:#a6e22e">@Override</span>
   <span style="color:#66d9ef">public</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">onClick</span><span style="color:#f92672">(</span>View v<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
   <span style="color:#75715e">//动态申请权限
</span><span style="color:#75715e"></span>    <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>ContextCompat<span style="color:#f92672">.</span><span style="color:#a6e22e">checkSelfPermission</span><span style="color:#f92672">(</span>MainActivity<span style="color:#f92672">.</span><span style="color:#a6e22e">this</span><span style="color:#f92672">,</span>Manifest<span style="color:#f92672">.</span><span style="color:#a6e22e">permission</span>
      <span style="color:#f92672">.</span><span style="color:#a6e22e">WRITE_EXTERNAL_STORAGE</span><span style="color:#f92672">)!=</span> PackageManager<span style="color:#f92672">.</span><span style="color:#a6e22e">PERMISSION_GRANTED</span><span style="color:#f92672">){</span>
     ActivityCompat<span style="color:#f92672">.</span><span style="color:#a6e22e">requestPermissions</span><span style="color:#f92672">(</span>MainActivity<span style="color:#f92672">.</span><span style="color:#a6e22e">this</span><span style="color:#f92672">,</span><span style="color:#66d9ef">new</span> String<span style="color:#f92672">[]{</span>Manifest<span style="color:#f92672">.</span><span style="color:#a6e22e">permission</span><span style="color:#f92672">.</span><span style="color:#a6e22e">WRITE_EXTERNAL_STORAGE</span><span style="color:#f92672">},</span>1<span style="color:#f92672">);</span>
    <span style="color:#f92672">}</span><span style="color:#66d9ef">else</span><span style="color:#f92672">{</span>
    <span style="color:#75715e">//执行启动相册的方法
</span><span style="color:#75715e"></span>     openAlbum<span style="color:#f92672">();</span>
    <span style="color:#f92672">}</span>
   <span style="color:#f92672">}</span>
  <span style="color:#f92672">});</span>
  <span style="color:#f92672">}</span>
<span style="color:#75715e">//获取权限的结果
</span><span style="color:#75715e"></span><span style="color:#a6e22e">@Override</span>
 <span style="color:#66d9ef">public</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">onRequestPermissionsResult</span><span style="color:#f92672">(</span><span style="color:#66d9ef">int</span> requestCode<span style="color:#f92672">,</span> <span style="color:#a6e22e">@NonNull</span> String<span style="color:#f92672">[]</span> permissions<span style="color:#f92672">,</span> <span style="color:#a6e22e">@NonNull</span> <span style="color:#66d9ef">int</span><span style="color:#f92672">[]</span> grantResults<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
  <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>requestCode <span style="color:#f92672">==</span> 1<span style="color:#f92672">){</span>
   <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>grantResults<span style="color:#f92672">.</span><span style="color:#a6e22e">length</span><span style="color:#f92672">&gt;</span>0<span style="color:#f92672">&amp;&amp;</span>grantResults<span style="color:#f92672">[</span>0<span style="color:#f92672">]</span> <span style="color:#f92672">==</span> PackageManager<span style="color:#f92672">.</span><span style="color:#a6e22e">PERMISSION_GRANTED</span><span style="color:#f92672">)</span> openAlbum<span style="color:#f92672">();</span>
   <span style="color:#66d9ef">else</span> Toast<span style="color:#f92672">.</span><span style="color:#a6e22e">makeText</span><span style="color:#f92672">(</span>MainActivity<span style="color:#f92672">.</span><span style="color:#a6e22e">this</span><span style="color:#f92672">,</span><span style="color:#e6db74">&#34;你拒绝了&#34;</span><span style="color:#f92672">,</span>Toast<span style="color:#f92672">.</span><span style="color:#a6e22e">LENGTH_SHORT</span><span style="color:#f92672">).</span><span style="color:#a6e22e">show</span><span style="color:#f92672">();</span>
  <span style="color:#f92672">}</span>
 <span style="color:#f92672">}</span>

<span style="color:#75715e">//启动相册的方法
</span><span style="color:#75715e"></span><span style="color:#66d9ef">private</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">openAlbum</span><span style="color:#f92672">(){</span>
  Intent intent <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> Intent<span style="color:#f92672">(</span><span style="color:#e6db74">&#34;android.intent.action.GET_CONTENT&#34;</span><span style="color:#f92672">);</span>
  intent<span style="color:#f92672">.</span><span style="color:#a6e22e">setType</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;image/*&#34;</span><span style="color:#f92672">);</span>
  startActivityForResult<span style="color:#f92672">(</span>intent<span style="color:#f92672">,</span>2<span style="color:#f92672">);</span>
 <span style="color:#f92672">}</span>
</code></pre></div><p>这里先初始化控件，然后动态申请权限，因为我们要读取照片肯定是要读取内存的权限，记得在AndroidManifest中要写明权限：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#f92672">&lt;</span>uses<span style="color:#f92672">-</span>permission android<span style="color:#f92672">:</span>name<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;android.permission.WRITE_EXTERNAL_STORAGE&#34;</span> <span style="color:#f92672">/&gt;</span>
</code></pre></div><p>获取权限后就打开相册选择。相册对应的action是android.intent.action.GET_CONTENT，setType(“image/*”)这个方法表示把所有照片显示出来，然后开启活动。启动活动选择完照片后就会返回一个intent到onActivityResult方法中，所以接下来的主要工作就是如果获取到返回的路径。</p>
<p>我们知道在安卓4.4以后是不能把文件的真实路径直接给别的应用的，所以返回的uri是经过封装的，所以我们要进行解析取出里面的路径。所以这里我们要进行判断安卓版本来进行不同的逻辑，先看代码：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#a6e22e">@Override</span>
 <span style="color:#66d9ef">protected</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">onActivityResult</span><span style="color:#f92672">(</span><span style="color:#66d9ef">int</span> requestCode<span style="color:#f92672">,</span> <span style="color:#66d9ef">int</span> resultCode<span style="color:#f92672">,</span> <span style="color:#a6e22e">@Nullable</span> Intent data<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
 <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>requestCode <span style="color:#f92672">==</span> 2<span style="color:#f92672">){</span>
 <span style="color:#75715e">//判断安卓版本
</span><span style="color:#75715e"></span>    <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>resultCode <span style="color:#f92672">==</span> RESULT_OK<span style="color:#f92672">&amp;&amp;</span>data<span style="color:#f92672">!=</span><span style="color:#66d9ef">null</span><span style="color:#f92672">){</span>
    <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>Build<span style="color:#f92672">.</span><span style="color:#a6e22e">VERSION</span><span style="color:#f92672">.</span><span style="color:#a6e22e">SDK_INT</span><span style="color:#f92672">&gt;=</span>19<span style="color:#f92672">)</span>
    handImage<span style="color:#f92672">(</span>data<span style="color:#f92672">);</span>
    <span style="color:#66d9ef">else</span> handImageLow<span style="color:#f92672">(</span>data<span style="color:#f92672">);</span>
   <span style="color:#f92672">}</span>
  <span style="color:#f92672">}</span>
 <span style="color:#f92672">}</span>

<span style="color:#75715e">//安卓版本大于4.4的处理方法
</span><span style="color:#75715e"></span><span style="color:#a6e22e">@RequiresApi</span><span style="color:#f92672">(</span>api <span style="color:#f92672">=</span> Build<span style="color:#f92672">.</span><span style="color:#a6e22e">VERSION_CODES</span><span style="color:#f92672">.</span><span style="color:#a6e22e">KITKAT</span><span style="color:#f92672">)</span>
 <span style="color:#66d9ef">private</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">handImage</span><span style="color:#f92672">(</span>Intent data<span style="color:#f92672">){</span>
  String path <span style="color:#f92672">=</span><span style="color:#66d9ef">null</span><span style="color:#f92672">;</span>
  Uri uri <span style="color:#f92672">=</span> data<span style="color:#f92672">.</span><span style="color:#a6e22e">getData</span><span style="color:#f92672">();</span>
  <span style="color:#75715e">//根据不同的uri进行不同的解析
</span><span style="color:#75715e"></span>  <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>DocumentsContract<span style="color:#f92672">.</span><span style="color:#a6e22e">isDocumentUri</span><span style="color:#f92672">(</span><span style="color:#66d9ef">this</span><span style="color:#f92672">,</span>uri<span style="color:#f92672">)){</span>
   String docId <span style="color:#f92672">=</span> DocumentsContract<span style="color:#f92672">.</span><span style="color:#a6e22e">getDocumentId</span><span style="color:#f92672">(</span>uri<span style="color:#f92672">);</span>
   <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span><span style="color:#e6db74">&#34;com.android.providers.media.documents&#34;</span><span style="color:#f92672">.</span><span style="color:#a6e22e">equals</span><span style="color:#f92672">(</span>uri<span style="color:#f92672">.</span><span style="color:#a6e22e">getAuthority</span><span style="color:#f92672">())){</span>
    String id <span style="color:#f92672">=</span> docId<span style="color:#f92672">.</span><span style="color:#a6e22e">split</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;:&#34;</span><span style="color:#f92672">)[</span>1<span style="color:#f92672">];</span>
    String selection <span style="color:#f92672">=</span> MediaStore<span style="color:#f92672">.</span><span style="color:#a6e22e">Images</span><span style="color:#f92672">.</span><span style="color:#a6e22e">Media</span><span style="color:#f92672">.</span><span style="color:#a6e22e">_ID</span><span style="color:#f92672">+</span><span style="color:#e6db74">&#34;=&#34;</span><span style="color:#f92672">+</span>id<span style="color:#f92672">;</span>
    path <span style="color:#f92672">=</span> getImagePath<span style="color:#f92672">(</span>MediaStore<span style="color:#f92672">.</span><span style="color:#a6e22e">Images</span><span style="color:#f92672">.</span><span style="color:#a6e22e">Media</span><span style="color:#f92672">.</span><span style="color:#a6e22e">EXTERNAL_CONTENT_URI</span><span style="color:#f92672">,</span>selection<span style="color:#f92672">);</span>
   <span style="color:#f92672">}</span><span style="color:#66d9ef">else</span> <span style="color:#66d9ef">if</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;com.android.providers.downloads.documents&#34;</span><span style="color:#f92672">.</span><span style="color:#a6e22e">equals</span><span style="color:#f92672">(</span>uri<span style="color:#f92672">.</span><span style="color:#a6e22e">getAuthority</span><span style="color:#f92672">())){</span>
    Uri contentUri <span style="color:#f92672">=</span> ContentUris<span style="color:#f92672">.</span><span style="color:#a6e22e">withAppendedId</span><span style="color:#f92672">(</span>Uri<span style="color:#f92672">.</span><span style="color:#a6e22e">parse</span><span style="color:#f92672">(</span><span style="color:#e6db74">&#34;content://downloads/public_downloads&#34;</span><span style="color:#f92672">),</span>Long<span style="color:#f92672">.</span><span style="color:#a6e22e">valueOf</span><span style="color:#f92672">(</span>docId<span style="color:#f92672">));</span>
    path <span style="color:#f92672">=</span> getImagePath<span style="color:#f92672">(</span>contentUri<span style="color:#f92672">,</span><span style="color:#66d9ef">null</span><span style="color:#f92672">);</span>
   <span style="color:#f92672">}</span>
  <span style="color:#f92672">}</span><span style="color:#66d9ef">else</span> <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span><span style="color:#e6db74">&#34;content&#34;</span><span style="color:#f92672">.</span><span style="color:#a6e22e">equalsIgnoreCase</span><span style="color:#f92672">(</span>uri<span style="color:#f92672">.</span><span style="color:#a6e22e">getScheme</span><span style="color:#f92672">())){</span>
   path <span style="color:#f92672">=</span> getImagePath<span style="color:#f92672">(</span>uri<span style="color:#f92672">,</span><span style="color:#66d9ef">null</span><span style="color:#f92672">);</span>
  <span style="color:#f92672">}</span><span style="color:#66d9ef">else</span> <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span><span style="color:#e6db74">&#34;file&#34;</span><span style="color:#f92672">.</span><span style="color:#a6e22e">equalsIgnoreCase</span><span style="color:#f92672">(</span>uri<span style="color:#f92672">.</span><span style="color:#a6e22e">getScheme</span><span style="color:#f92672">())){</span>
   path <span style="color:#f92672">=</span> uri<span style="color:#f92672">.</span><span style="color:#a6e22e">getPath</span><span style="color:#f92672">();</span>
  <span style="color:#f92672">}</span>
  <span style="color:#75715e">//展示图片
</span><span style="color:#75715e"></span>  displayImage<span style="color:#f92672">(</span>path<span style="color:#f92672">);</span>
 <span style="color:#f92672">}</span>


<span style="color:#75715e">//安卓小于4.4的处理方法
</span><span style="color:#75715e"></span><span style="color:#66d9ef">private</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">handImageLow</span><span style="color:#f92672">(</span>Intent data<span style="color:#f92672">){</span>
  Uri uri <span style="color:#f92672">=</span> data<span style="color:#f92672">.</span><span style="color:#a6e22e">getData</span><span style="color:#f92672">();</span>
  String path <span style="color:#f92672">=</span> getImagePath<span style="color:#f92672">(</span>uri<span style="color:#f92672">,</span><span style="color:#66d9ef">null</span><span style="color:#f92672">);</span>
  displayImage<span style="color:#f92672">(</span>path<span style="color:#f92672">);</span>
 <span style="color:#f92672">}</span>

<span style="color:#75715e">//content类型的uri获取图片路径的方法
</span><span style="color:#75715e"></span><span style="color:#66d9ef">private</span> String <span style="color:#a6e22e">getImagePath</span><span style="color:#f92672">(</span>Uri uri<span style="color:#f92672">,</span>String selection<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
  String path <span style="color:#f92672">=</span> <span style="color:#66d9ef">null</span><span style="color:#f92672">;</span>
  Cursor cursor <span style="color:#f92672">=</span> getContentResolver<span style="color:#f92672">().</span><span style="color:#a6e22e">query</span><span style="color:#f92672">(</span>uri<span style="color:#f92672">,</span><span style="color:#66d9ef">null</span><span style="color:#f92672">,</span>selection<span style="color:#f92672">,</span><span style="color:#66d9ef">null</span><span style="color:#f92672">,</span><span style="color:#66d9ef">null</span><span style="color:#f92672">);</span>
  <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>cursor<span style="color:#f92672">!=</span><span style="color:#66d9ef">null</span><span style="color:#f92672">){</span>
   <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>cursor<span style="color:#f92672">.</span><span style="color:#a6e22e">moveToFirst</span><span style="color:#f92672">()){</span>
    path <span style="color:#f92672">=</span> cursor<span style="color:#f92672">.</span><span style="color:#a6e22e">getString</span><span style="color:#f92672">(</span>cursor<span style="color:#f92672">.</span><span style="color:#a6e22e">getColumnIndex</span><span style="color:#f92672">(</span>MediaStore<span style="color:#f92672">.</span><span style="color:#a6e22e">Images</span><span style="color:#f92672">.</span><span style="color:#a6e22e">Media</span><span style="color:#f92672">.</span><span style="color:#a6e22e">DATA</span><span style="color:#f92672">));</span>
   <span style="color:#f92672">}</span>
   cursor<span style="color:#f92672">.</span><span style="color:#a6e22e">close</span><span style="color:#f92672">();</span>
  <span style="color:#f92672">}</span>
  <span style="color:#66d9ef">return</span> path<span style="color:#f92672">;</span>
 <span style="color:#f92672">}</span>

<span style="color:#75715e">//根据路径展示图片的方法
</span><span style="color:#75715e"></span><span style="color:#66d9ef">private</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">displayImage</span><span style="color:#f92672">(</span>String imagePath<span style="color:#f92672">){</span>
  <span style="color:#66d9ef">if</span> <span style="color:#f92672">(</span>imagePath <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span><span style="color:#f92672">){</span>
   Bitmap bitmap <span style="color:#f92672">=</span> BitmapFactory<span style="color:#f92672">.</span><span style="color:#a6e22e">decodeFile</span><span style="color:#f92672">(</span>imagePath<span style="color:#f92672">);</span>
   imageView<span style="color:#f92672">.</span><span style="color:#a6e22e">setImageBitmap</span><span style="color:#f92672">(</span>bitmap<span style="color:#f92672">);</span>
  <span style="color:#f92672">}</span><span style="color:#66d9ef">else</span><span style="color:#f92672">{</span>
   Toast<span style="color:#f92672">.</span><span style="color:#a6e22e">makeText</span><span style="color:#f92672">(</span><span style="color:#66d9ef">this</span><span style="color:#f92672">,</span><span style="color:#e6db74">&#34;fail to set image&#34;</span><span style="color:#f92672">,</span>Toast<span style="color:#f92672">.</span><span style="color:#a6e22e">LENGTH_SHORT</span><span style="color:#f92672">).</span><span style="color:#a6e22e">show</span><span style="color:#f92672">();</span>
  <span style="color:#f92672">}</span>
 <span style="color:#f92672">}</span>
</code></pre></div><p>上面的代码很多但是不要慌，咱们一个一个来，不难理解的。首先我们知道不同的版本有两个不同的方法来展示图片，就是：handImage和handImageLow。content类型的uri通过getImagePath这个方法来获取真实路径，真实路径通过displayImage这个方法就可以展示出来了。所以主要的工作就是怎么拿到真实路径。现在思路清晰了，让我们一个个来看：</p>
<p>首先来看一下两个工具方法：getImagePath和displayImage。</p>
<ul>
<li>getImagePath学过内容提供器会知道这个就是通过内容提供器来获取数据。通过这个uri以及selection获取到一个Cursor对象。Cursor是什么呢？不了解的读者可以查看这篇博客Android中的Cursor。然后通过这个Cursor对象的MediaStore.Images.Media.DATA这个参数就可以获取到真实路径了。</li>
<li>displayImage这个方法收一个真实路径字符串，直接通过BitmapFactory.decodeFile这个方法获取到Bitmap再显示出来就行了</li>
</ul>
<p>了解了工具方法后，我们的目的就很明确啦：content类型的uri或者真实路径的String。
首先是版本低于4.4的，因为返回的是真实的uri，也就是content开头的那个，所以直接通过getImagePath获取真实路径再通过displayImage展示即可。</p>
<p>接下来这个可能看起来有点头疼，因为要解析不同类型的Uri。我们一个个来看：</p>
<ul>
<li>第一种是document类型的uri。至于什么是document类型的uri这里就不深入了，只要知道有这种类型的uri，要怎么处理就好了。首先我们要获取一个DocumentId，然后再分两种情况处理：</li>
</ul>
<p>第一种的是media格式的，然后我们要取出后半截字符串我们才能获取到真正的id，这里就真正的id指的是对应数据库表中的id，用于selection的。MediaStore.Images.Media.EXTERNAL_CONTENT_URI就是这个照片的content类型uri，再把selection放进去即可。
第二种通过ContentUris.withAppendedId这个方法即可获取到content类型的uri，这个方法负责把id和contentUri连接成一个新的Uri。这个方法在这里也不详细讲解。</p>
<ul>
<li>第二种的是content类型的，那不用说直接用就行了</li>
<li>第三种的是file类型的，这个就是真实路径了，直接getPath就可以获取到了。</li>
</ul>
<p>看完上述内容，你们掌握Android应用中是怎么调用系统相册中的照片的的方法了吗？</p>

        </div>

        
<div class="post-archive">
    <ul class="post-copyright">
        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/android/Android%E5%BA%94%E7%94%A8%E4%B8%AD%E6%98%AF%E6%80%8E%E4%B9%88%E8%B0%83%E7%94%A8%E7%B3%BB%E7%BB%9F%E7%9B%B8%E5%86%8C%E4%B8%AD%E7%9A%84%E7%85%A7%E7%89%87%E7%9A%84/">https://luckly.work/post/android/Android%E5%BA%94%E7%94%A8%E4%B8%AD%E6%98%AF%E6%80%8E%E4%B9%88%E8%B0%83%E7%94%A8%E7%B3%BB%E7%BB%9F%E7%9B%B8%E5%86%8C%E4%B8%AD%E7%9A%84%E7%85%A7%E7%89%87%E7%9A%84/</a></li>
        <li><strong>版权声明：</strong>本作品采用<a rel="license" href="https://creativecommons.org/licenses/by-nc-nd/4.0/">知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议</a>进行许可，非商业转载请注明出处（作者，原文链接），商业转载请联系作者获得授权。</li>
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        <li><a href="/post/android/android%E7%B3%BB%E5%88%973%E5%AD%A6%E4%B9%A0%E8%B7%AF%E7%BA%BF/">《Android系列3学习路线》</a></li>
        
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